Ku-band 20-W GaAsPHEMT high-power amplifiers using power splitting and combining circuits with asymmetric structure

Power splitting and combining circuits with asymmetric structure characteri zed by unequal linewidths of split lines and a splitting point shifted from the center have been:developed. Amplitude and phase splitting characterist ics comparable to those of conventional splitting circuits have been achiev ed. This eight-way power splitting/combining circuit with asymmetric struct ure has been used td-develop a Ku-band power amplifier. Calculations and ex periments show that both the gain and power of the Ku-band amplifier with a symmetric structure are superior to those of conventional high-power amplif iers with symmetric structure. (C) 2000 Scripta Technica.